Can you get insurance for a modified car in the UK?
Yes. Modified car insurance is a well-established specialist market in the UK, but it requires a different approach to standard cover. Mainstream comparison sites and high-street insurers price vehicles based on manufacturer specifications — any deviation from that baseline creates a risk profile their automated systems cannot accurately assess, often resulting in inflated quotes, policy exclusions, or outright declines.
Specialist modified car insurance brokers work with underwriters who understand performance vehicles, custom builds, and aftermarket modifications. They can assess your car accurately and find cover that genuinely reflects its value and your needs — rather than a generic policy that may not pay out if a modification was not properly declared.
What counts as a modification?
Any change from the manufacturer's original factory specification is a modification and must be declared. This includes changes that may seem minor as well as significant performance or aesthetic work. Common modifications include:
- Performance modifications — engine remaps (ECU tuning), turbo or supercharger upgrades, induction kits, uprated intercoolers, performance exhaust systems, uprated brakes and suspension.
- Aesthetic modifications — body kits, spoilers, splitters, custom or non-standard paint, vinyl wraps, window tinting, aftermarket alloy wheels.
- Suspension and handling — lowered or raised suspension, coilovers, uprated anti-roll bars, widened track.
- Interior modifications — roll cages, bucket seats, harnesses, custom dashboards, aftermarket audio or entertainment systems.
- Lighting — LED or HID headlight conversions, aftermarket interior or exterior lighting.
- Safety modifications — dash cams, tracking devices, and immobilisers are generally viewed positively by insurers, but should still be declared.
If you are in any doubt whether something counts as a modification, declare it. Non-disclosure of a modification — even an apparently minor one — can give your insurer grounds to void your policy and refuse a claim.
Why modifications complicate standard insurance
Standard insurers use actuarial data based on vehicles as they leave the factory. A modification changes multiple variables simultaneously — the vehicle performance, its value, its repair costs, and in some cases its appeal to thieves. Automated pricing systems cannot handle this complexity, which is why modified cars are either declined outright or quoted at inflated premiums that do not accurately reflect the actual risk.
Specialist underwriters who focus on modified vehicles have the expertise to assess these variables properly. An engine remap that adds 50bhp is a very different risk depending on the driver, the vehicle, where it is kept, and how it is used. Specialist brokers present this full picture rather than simply flagging a modification as a risk multiplier.
Types of modified car insurance
Depending on how your vehicle is used and built, there are different types of cover to consider:
- Standard road use — comprehensive or third-party cover for a modified daily driver or weekend car. The most common requirement and well served by specialist brokers.
- Agreed value policies — for high-value or show-quality builds where market value at the time of claim would not reflect the true cost of the vehicle. An agreed value policy fixes the insured amount in advance, giving certainty that the full build value is covered.
- Track day insurance — standard road policies exclude track use. If you take your car to track days, you need specific track day cover, which is available through specialist brokers.
- Show car and laid-up cover — for vehicles that are not used on the road and are kept SORN. Provides protection against fire, theft, and damage while the vehicle is stored.
- Club and limited mileage policies — some specialist insurers offer policies designed for cars used primarily for shows and events, with limited annual mileage and potentially more competitive premiums.
Performance modifications and engine remaps
Engine remaps are one of the most common modifications and one of the most significant from an underwriting perspective. An ECU remap can increase power output substantially, change the vehicle's insurance group classification, and affect its value.
Specialist brokers who work with remapped vehicles understand this. They know which underwriters have appetite for remapped cars, how to present the specific power figures and tune details, and how to find cover that is priced fairly rather than punitively. The same applies to more significant engine work — forced induction upgrades, engine swaps, and other power modifications.
The importance of accurate valuation
A heavily modified vehicle is almost always worth more than its standard equivalent — and potentially much more than its market value as a used car. A standard comprehensive policy will typically pay out the market value of the vehicle at the time of a total loss, which may be far less than the cost of the modifications themselves.
An agreed value policy, available through specialist brokers, fixes the insured value in advance based on a valuation that takes the modifications into account. For any vehicle where significant money has been spent on modifications, this is worth exploring.
What you must declare
All modifications must be declared when taking out or renewing a policy. This includes modifications made before you bought the car — if you purchase a vehicle that has already been modified, you are responsible for declaring those modifications to your insurer.
Non-disclosure of a modification can void your policy entirely, meaning any claim — for any reason, not just one related to the modification — can be refused. This applies even to modifications that seem unlikely to affect the risk, such as cosmetic changes or aftermarket audio.
Why specialist brokers are the right route for modified cars
Comparison sites present your vehicle to a panel of standard insurers and return the cheapest quote. For a modified car, the cheapest quote from a standard insurer is rarely the right policy — it may exclude the modifications, undervalue the vehicle, or be voided at the point of claim if a modification was not properly captured in the automated form.
Specialist brokers take the time to understand your build, document the modifications accurately, and approach underwriters who genuinely cover modified vehicles rather than standard insurers who will simply exclude them. The result is a policy that actually protects your investment.
What to expect when you enquire through CoverAble
When you submit an enquiry through CoverAble, your details are sent directly to the specialist broker you have selected. The broker will typically contact you by phone to discuss your vehicle and modifications in detail — make, model, year, engine specification, and a full list of modifications — before sourcing quotes.
Having a comprehensive list of your modifications ready, along with receipts or valuations where available, will help your broker present your case accurately and efficiently.
There is no charge for using CoverAble. The brokers listed on this platform are FCA-authorised and operate independently. CoverAble does not participate in the transaction, receive commission, or make recommendations about which broker to use.
Frequently asked questions
Do I need to declare modifications that were on the car when I bought it?
Yes. You are responsible for declaring all modifications present on the vehicle, regardless of whether you made them. If you buy a modified car, ask the seller for a full list of modifications before taking out insurance, and declare them all to your broker.
Will an engine remap void my manufacturer warranty?
This is a question for your manufacturer or dealer rather than your insurer, but it is worth being aware of. From an insurance perspective, a remap must be declared. Whether it affects your manufacturer warranty is a separate matter governed by your warranty terms.
Can I get agreed value cover for my modified car?
Yes. Agreed value policies are available through specialist modified car insurance brokers. They are particularly worth considering for any vehicle where the cost of modifications significantly exceeds the standard market value. Your broker will advise on the valuation process and which underwriters offer agreed value terms.
Is track day use covered under my standard policy?
No. Standard road insurance policies exclude track use. If you take your modified car to track days, you need separate track day insurance. Specialist brokers can arrange this alongside or separately from your road cover.
My car has been lowered — do I need to tell my insurer?
Yes. Lowered suspension is a modification that must be declared. The degree of lowering and the type of suspension used (coilovers, springs, air suspension) are all relevant details your broker will want to know.
How do I find a broker who covers modified cars?
CoverAble lists specialist brokers who have indicated they cover modified vehicles. You can search by insurance type and submit an enquiry directly to brokers whose profile matches your situation. Your vehicle and modification details are shared only with the broker you choose to contact.